Rømer was given every opportunity to learn mathematics and astronomy using Tycho Brahe's astronomical observations, as Bartholin had been given the task of preparing them for publication.

He carried his enquiries so far into the occult sciences of abstruse and hidden nature, that, after having given most ample proofs, by his writings concerning physiognomy, geomancy, and chiromancy, he moved on to the study of philosophy, physics, and astrology ; which studies proved so advantageous to him, that, not to speak of the two first, which introduced him to all the popes of his time, and acquired him a reputation among learned men, it is certain that he was a great master in the latter, which appears not only by the astronomical figures he had painted in the great hall of the palace at Padua, and the translations he made of the books of the most learned rabbi Abraham Aben Ezra, added to those he himself composed on critical days, and the improvement of astronomy, but by the testimony of the renowned mathematician Regiomontanus, who made a fine panegyric on him, in quality of an astrologer, in the oration he delivered publicly at Padua when he explained there the book of Alfraganus.

In positional astronomy, two celestial bodies are said to be in opposition when they are on opposite sides of the sky, viewed from a given place ( usually the Earth ).

The second part is a detailed sky atlas for amateur astronomy observations: for each constellation, a list of bright and dim stars, deep sky and other notable objects is given to the reader.

The concept of a spherical Earth dates back to ancient Greek philosophy from around the 6th century BC, but remained a matter of philosophical speculation until the 3rd century BC when Hellenistic astronomy established the spherical shape of the earth as a physical given.

" Only one award is given each year, according to a rotating scheme – astronomy and mathematics ; then geosciences ; then biosciences.

In geometry, physics, astronomy, geography, and related sciences, a plane is said to be horizontal at a given point if it is perpendicular to the gradient of the gravity field at that point — in other words, if apparent gravity makes a plumb bob hang perpendicular to the plane at that point.

The vacant chair of astronomy at the University of Edinburgh was given to him on the advice of Prime Minister Lord Melbourne.

is given up to mathematics, under which head are included music, geometry, astronomy, astrology, weights and measures, and metaphysics.

In astronomy, the brightness of an object is given in terms of its absolute magnitude.

The scripts are designed to be as platform independent as possible, given the need to facilitate mirroring on different systems around the world, although the growing use of Linux as the operating system of choice within astronomy has led to increasing optimization of the scripts for installation on that platform.

A traditional division of observational astronomy is given by the region of the electromagnetic spectrum observed:

Faraday rotation is an important tool in astronomy for the measurement of magnetic fields, which can be estimated from rotation measures given a knowledge of the electron number density.

This award is arguably the most prestigious award given in astronomy.

* The Richard Emmons Award is given for a lifetime of contributions to the teaching of astronomy to college non-science majors.

It is one of seven international and national awards for service to astronomy and astronomy education given by the Astronomical Society of the Pacific.

The Robert J. Trumpler Award of the Astronomical Society of the Pacific is given annually to a recent recipient of the Ph. D degree whose thesis is judged particularly significant to astronomy.

In astronomy the sizes of objects in the sky are often given in terms of their angular diameter as seen from Earth, rather than their actual sizes.

In astronomy, limiting magnitude is the faintest apparent magnitude of a celestial body that is detectable or detected by a given instrument.

The Somnium Scipionis, as it is known, survives because it was the subject of a commentary by Macrobius, who excerpted large portions ; both he and his readers in the Middle Ages and Renaissance were mainly interested in its discussion of astrology and astronomy, especially given the loss of the rest of the book.

The way in which the coordinates are given by the Chinese astronomers have things in common with the equatorial coordinate system, the equivalent of the longitude and latitude on the celestial sphere, where the poles are determined by the axis of the Earth's rotation, these coordinates are called right ascension and declination respectively in astronomy.

This category collects articles about notable prizes, awards, and medals given for work in the field of astronomy and related fields.

There is a large number of amateur astronomical societies around the world that serve as a meeting point for those interested in amateur astronomy, whether they be people who are actively interested in observing or " armchair astronomers " who may simply be interested in the topic.

In astronomy, declination ( abbreviated dec ; symbol δ ) is one of the two direction coordinates of a point on the celestial sphere in the equatorial coordinate system, the other being either right ascension or hour angle.

The English sinologist Cullen emphasizes the point that there was no concept of a round Earth in ancient Chinese astronomy:

Copernicus's book, De revolutionibus orbium coelestium ( On the Revolutions of the Celestial Spheres ), published just before his death in 1543, is often regarded as the starting point of modern astronomy and the defining epiphany that began the scientific revolution.

While Greek astronomy — thanks to Alexander's conquests — probably influenced Indian learning, to the point of introducing trigonometry, it seems to be the case that Indian mathematics is otherwise an indigenous tradition ; in particular, there is no evidence that Euclid's Elements reached India before the 18th century.

In astronomy and celestial navigation, the hour angle is one of the coordinates used in the equatorial coordinate system to give the direction of a point on the celestial sphere.

In astronomy, hour angle is defined as the angular distance on the celestial sphere measured westward along the celestial equator from the meridian to the hour circle passing through a point.

* Apparent retrograde motion, in astronomy, is the apparent motion of planets as observed from a particular vantage point

The geocentric model entered Greek astronomy and philosophy at an early point ; it can be found in Pre-Socratic philosophy.

* A Lagrangian point in physics and astronomy

According to the historian of science Norwood Russell Hanson: There is no bilaterally-symmetrical, nor excentrically-periodic curve used in any branch of astrophysics or observational astronomy which could not be smoothly plotted as the resultant motion of a point turning within a constellation of epicycles, finite in number, revolving around a fixed deferent. Any path — periodic or not, closed or open — can be represented with an infinite number of epicycles.

In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as celestial coordinates, or elliptical orbital elements of a celestial body, where these are ( as usual ) subject to perturbations and vary with time.

Blind deconvolution is a well-established image restoration technique in astronomy, where the point nature of the objects photographed exposes the PSF thus making it more feasible.

When performing image synthesis in radio interferometry, a specific kind of radio astronomy, one step consists of deconvolving the produced image with the " dirty beam ", which is a different name for the point spread function.

In addition, they claim the scientific data in geology and astronomy point to a young Earth, against the consensus of the general scientific community.

In The Sirius Mystery, Temple advanced the conclusion that the Dogon ’ s knowledge of astronomy and non-visible cosmic phenomenon could only be explained if this knowledge had been imparted upon them by an extraterrestrial race that had visited the Dogon at some point in the past.

The Airy function is also important in microscopy and astronomy ; it describes the pattern, due to diffraction and interference, produced by a point source of light ( one which is smaller than the resolution limit of a microscope or telescope ).

The basic elements of Ptolemaic astronomy, showing a planet on an epicycle with a deferent and an equant point.

* In astronomy, one of two pairs of stars popularly called " The Pointers ": Alpha Centauri and Beta Centauri, which point to the Southern Cross ; or Alpha Ursae Majoris ( Dubhe ) and Beta Ursae Majoris ( Merak ), which point to Polaris

By this point the original site was well within the rapidly growing city's lit areas, and no longer suitable for astronomy.